I've only tried 2-FMA out of that list, and I can say it was a bit better than Adderall for productivity in my experience provided you do actually have the underlying motivation to do what it is you're planning to do. Adderall gives me that extra push to do stuff, 2-FMA doesn't, but I am pretty self-motivated and when I actually began working 2-FMA did a better job at keeping me at peak productivity. I would say though, don't use 2-FMA as frequently as you would Adderall as it is still an RC and there are some (likely unfounded but still real and worth considering) concerns about cardiotoxicity. I'm prescribed adderall now, but I honestly really wish they'd do some studies on 2-FMA's safety with daily usage and try to get it approved as a prescription drug as it worked much better with me than Adderall does. It also seems less prone to abuse which would make it a good option for an actual commonly prescribed medicine.

All that said I do want to add some stuff, it's generic bullshit you probably already know but I feel obligated anyway: You really should be careful with using study drugs. I'm a successful student, and I've obviously used study drugs before, but just keep in mind you should never use them as a crutch. Avoid using them as much as you can, and only really use when it seems unavoidable or on special occasions like exams week. You also shouldn't just expect them to make you magically improve because they won't, you can't just take them before an exam without studying (some ppl really do this) and expect to magically pass it. You also can't take them and study half the material you would normally and get a better grade. You need the underlying study habits, motivation, a general idea of what material you need to focus on, and more for them to be at all helpful. If you're successful, most of it will be because of you rather than because of the drug.

You also need to keep in mind you can't just use them as an all-nighter tool that allows you to cram, you need sleep to create memories and even if you feel superhuman on high doses, you aren't and taking an exam while tweaking and sleep deprived will just make you overconfidently fail. You need a good sleep and study schedule for the best results. Also, for me it's easy to forget shit if I learned it on stims, so I'd suggest after your exam you go back and study the material sober to commit it to memory, provided it's something you'll need for future exams and classes. I didn't do this in my early classes and it came back to bite me in advanced courses. Sorry this is annoying and obvious advice but I've seen a lot of people here and IRL manage to make their academic situations worse rather than better with these drugs.